Collapsible core.



J. B. WALKER. GO'LLAPSIBLE CORE; ArPLmATIoN FILED 111x223, 1911.

Patented IJuly f1, 1911.

2 SHEETS-SHEET 1.

ATTORNEY JOH'N B. WALKER, OF ENSLEY, ALABAMA.

eoLLArsrBLn conn.

specification of Letters Patent.

Patented July 4, 1911.v

Application filed January 1911. Serial No. 604,135.

To all whom t may concern:

Bc it known that I, JOHN B. Wanken a citizen of the United States, residingv at Ensley, in the county of Jefferson and State of Alabama, have invented'anew and usefuly l Collapsible Core, of which the following is a specilication.

, The invention relates to improvements in 'collapsible cores. 10.-.

The object of the present invention is to improve the construction of collapsible cores, and to provide a simple and comparatively inexpensive core barrel, designed for making ironand lsteel ingot molds, and adapted to maintain the sections or staves of the barrel rigidly in proper position while the core is being rammednp, and capable also'of permitting a small amount of movement to allowfor shrinkage when the metal cools, and of limiting such movement of the staves or sections so as to prevent a crumbling of the core.

A further object of the invention is to provide a collapsible core barrel of this character in which the staves or sections will have sufficient inward movement to permit the casting to be removed by lifting it over the core barrel and also to permit the staves or sections to be moved inward, and the barrel to be pulled out of the casting by a single operation.

Another object of the invention is to provide la collapsible barrel of thischaracter, equipped with means for preventing the sand from breaking at the corners or angles formed by the movable sections or staves.

With these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed Tout in the claims hereto appended; it being understood that Y various changes in the form, proportion, size and minor details of construction, withinthe scope of the claims, may be resorted to with-l out departingrom the spirit or sacrificinganyof-lthefadvantages' ofthe invention.

'y 'In the drawings z-Figure 1 is a vertical Sectional view of a collapsible core, con-I structed in accordance wlththis 1nvent1on.

Fig. 2 is a vertical sectional view on the line 2 2 of Fig. 1, the plunger being shown 1n elevation. Fig. 3 is a horizontal sectional view on the line 3-3 of Fig. 1. Fig. 4 is a horizontal sectional view on the line l-l of Fig. 2. Fig. 5 is a detail perspective view of o ne of the angle bars. Fig. 6 is a detail sectional. view of one corner of the core barrel, showing another form of the fillery strip. I

Like numerals of reference designate corresponding' parts in all the figures'of the drawings. In the accompanying drawings in which 1s illustrated the preferred embodiment of the invention, 1 and 2 designate angularly related side and end sections or staves, connected at their inner faces with a vertically movable plunger' 3 by inclined upper and lower toggle links 4 and 5. The sections or staves, which are constructed of suitable metal, form a rectangular core barrel, but' the core barrel may be of any other preferred form and may be composed of any other desired number of sections to adapt the core barrel for use in molds for ldier-l ent articles of various sizes and shapes, the core barrel not being restrictedin its use to Vthe making of iron and steel ingot molds.

The sections or staves, which have vent openings 6, are provided at their inner faces with spaced eyes 7 and 8, located at the upper and lower portionsof the sections or staves of horizontal pintles 9 and 10 for hinging the.. outer ends of the toggle links to the sections or staves. The links 4:, which connect the side sections or staves 2 with the vertically movable operating member or plunger, are approximately T-shaped and are located at the side faces of the operating member or plunger, and their outer' portions lor heads extend across the space between the eyes 7, and they are p'ivoted at their inner ends in upper and lower vertical slots l1 of the plunger 3. The plunger 3, which is substan- .95

tially flat, is provided adjacent to the slots with enlargements, which are arranged in pairs -and in which are formed eyes or openings 12 for the reception of inner horizontal pintles 13.' The other, links 5, which y are located at the side edges of the plunger,

are .approximately U -shaped and extend across the space between the eyes S, and they Y straddle the side edges of the vertically movable plunger and are'hinged to the same by horizontal pintles 14, which pass through openings in the plunger 3,.l As thel toggle links are inclined and extend upwardly and inwardly from the inner faces of .the staves or sections, the latter when-separated or in an extended position are adapted to be `moved inward by exterior pressure,'when the plunger is `free to move upwardly. The downward movement of the plunger' with respect to the staves or sections expand the core barrel. T he horizontal pivots or pintles, which hinge the toggle links to the Sections or staves and to the vertically movable plunger, are each provided t one e with a head and at the other end ,with a mov-lf. able key, but any other desired orm\ of pivot or pintle may be employed.

.j The plunger is provided at its upper end with an eye 15 and it carries a rectangular.

cover 16, consisting of a plate havi-ng a central slot 17 to receive the plunger and retained thereon by a tapered key 18, secured in a slot 19of the plunger and engaging the upper face' of the top or cover. The top i with a reduced rectangular port-ion or lug 20, and it has supporting flanges 21, projecting horizontally from the upper end of ,the reduced portion or lug20. The lug extends through la central opening 22 in a drag plate or base 23, which constitutes the bottom of the moldand which may be in the form of l a stool, as illustrated in the accompanying drawings, in which supports 24 are provided. The drag plate or base may be provided with suitable vent holes, and the supports elevate it sufficiently-to maintain the' lower end of the plunger out of contact with the supporting surface. Any suitable base may be employed and either'end of theV core barrel formed bythe staves or sections may. be arranged at the bottom of the mold.

The side edges 25 and 26 of the staves or sectionsare beveled and when the core barrel is entirely collapsed, the beveled edges are brought int-o contact with each other.`

The expansion of the core barrel spaces the beveled side edges of the staves or sections from each other, and in order to prevent the sand from breaking at the corners or angles formed bythe staves orl sections, the col-i` `i lapsible core barrel is equipped with filler strips 27, which may, as illustrated in Figs.

1 to5 inclusive, consist of pieces of angle.

iron or other suitable material. When the angle filler stripsv 27A are employed, they are placed over the corners of the core, as illustrated in Figs. 3 and 4; of the drawings, and

j they are adapted to remain iny position while the core barrel is being rammed and also While the metal is being poured, as they will not interfere with the inward movement "of thesections, which is necessary to compen- `sate"forthe shrinkage of the metal. The

angle strips cover the intervening spaces between the side edges of the sections of the core, and the sides or wings overlap and tit againstthe outer faces of the said sections. The angle strips are provided at their angles with vent openings, which are located at the spaces between the side edges of the sections ot'\\the core, and they are removed when it is desired to completely collapse the core barrel. Instead of employing tpngle filler strips, the space between the side et ges of the staves or sections of the core barrel may be. llcd by straight wooden strips 29, as illustrated in Fig. 6 of the drawings. The wooden filler strips remain in lthe vcore barrel only-while the latter is being rammed, and they are removed prior to the baking of t-he core and the pouring of the metal. l y l The operating number or plunger is 'held at the'limit of fits downward movement by a key 30 to maintain the staves'or sections rigidly in proper position for ramming the core barrel. The key 30, which extends horizontallyl through a slot 31 in the reduced lower portion or lug of the plunger, engages the lower face of the drag plate or base, as clearly illustrated in Fig. 1 of the drawings. The key is provided withv a plurality of portions32, 33 and 34 of different widths. The large portion 32 is wedgeshaped and holds the plungerA at the limit of its downward movement, and the intermediate-portion 33, which is slightly narrower than the wedge-shaped portion 32, is located between the wedge-shaped portion 32 and the portion 34, and is adapted to permit a limited upward movement of the plunger suticient to allow for the shrinkage of the casting in cooling. The portion 34, which is relatively narrow, is adapted to permit a complete collapsing of the core barrel. The key projects beyond the 'opposite edges of the base plate, and it is equipped at one end with a removable projection 35, preferably in the form of a dowel pin and havino' a reduced lower portion 36, fitted in a soc ret 37 in the upper edge of the key. The projection 35 is spaced from the base `.plate when the wedge-shaped lode-:"-

ing portion 32 is in engagement with the plunger. The wedge-shaped portion 32 operates to hold the staves or sections rigidly upon the base While the core is rammed and also until the metal is poured. As soon as the metal is poured, the key is moved longitudinallyto carry the intermediate width or. portion 33 to the slot of the plunger, such movement of the key being limited by the projection 35, which engages the edge of the base. When it is desired 4to collapse the core barrel completely, the projection .is removedfromrthe-key andlthe latter may be withdrawn from( the slot. of the plunger.

from the mold. The castingmay be either lifted overt-he core barrel, or the core barrel may be withdrawn from the casting without -the application of any force.'k

When the latter is desired, the core barrel 4may be collapsed land lifted from the mold by a single operation,- it being only necessary to lift the vertically movable operating member or plungerto secure both results.,

wardly toward and from each other, and exteriorly arranged angular filler strips fitting against the outer facesof the sections at the side edges thereof and covering the space between the same to prevent the sand from breaking down, said strips being adapted to permit inward movement of the sections.

2.' A collapsible core including a plurality of sections movable inwardly and outwardly, mechanism connected with the sections for expanding and contracting the same, said mechanism including a movable operating member, and means for locking the member against movement and for permitting a limited movement of the member and a slight inward' movement of the sections to allow for shrinkage of the cast metal in cooling.

3. A collapsible core including a plurality of sections movable inwardly and outwardly, a vertically movable plunger, links connecting the plunger with the sections, and locking mechanism engaging the plunger for holding the sections against inward movement and adjustable to permit a limited movement ofthe plunger and a slight inward movement of the sections to allow for the shrinkage of the cast metal in cooling.

4. A collapsible core including a plurality of sections-movable inwardly and outwardly, mechanism connected with the sections for expanding and contracting the same, said mechanism including a movable operating member, and a key engaging themember and'having a plurality of port-ions of different widths adapted to lock the said member against movement and to vpermit a limitedmovement thereof.v

5. A collapsible core comprising a plurality of sect-ions movable inwardly and outwardly, mechanism connected with the sections for expanding and contracting the same, said mechanism including a movable operating member, and a key havingfa wedge-shaped portion engaging the said member to lock the same against movement,

said key being also provided with anar-' rower portion to permit a limited movevment of the saidmeinber.

6. A collapsible core comprising a plu,-v rality of sections movable inwardly and outwardly, mechanism connected wit-h'the sec-- tions for expanding and contiactingjthel same, said mechanism including'a movable operating member, and a key having a wedge-shaped port-ion engaging the said member to lock the sameagainst movement, said key being also provided with a relatively narrow portion adapted to permit the complete collapsing of the sections.

7. A collapsible core comprising a plufrality of sections movable inwardly and outwardly, mechanism connected with the sec` tions for expandingand contracting the same, said mechanism including a movable" operating member', and a key engaging-the movable member and provided with a wedgeshaped portion for locking the same against movement and having a plurality of portionsof different widths, one of the latter portions permitting a slight movement of the member and the other permitting a com- 4plete collapsing of the core.

S. A collapsible core comprising a plurality of sections movable inwardly and outwardly, mechanism connected with the sections for expanding and contracting the same, said mechanism including a movable operating` member, anda key engaging the saidniember and provided with a wedgeshaped locking port-ion andliaving a plurality of narrower portions of different widths, and a removable stop for limiting the movement of the key.

9. A collapsible core including a base, a v plurality of sections, a plunger located within 'the sections and extending through the base, toggle links connecting the sections with the plunger, and a key engaging the plunger and the base-and having a plurality of portions of diiferent widths adapted to lock the plunger and capable also of permitting a limited movement of the same.

10. A collapsible core including a base, a plurality of sections, a plunger located within the sections and extending through the base, toggle links connecting the sections with the plunger and provided below the same with. a slot, a key extending through the slot of the plunger and engaging the same and the base, and a removable `projectingdev'ice carried by the key and arranged to engage the base.

ll. A collapsible core includinga base having an opening, a plurality ofI sections arranged upon the base, a vertically movable plungerlocated Within the sections and having aV reduced'portion extending through the opening of the base and provided With aj slottoggle links connecting the sections with the plunger, and a key operating in the slot of the plunger and engaging the ranged upon the base, a vertically movableplunger located Within the sections and eX- tending through the opening of the base and provided with means for engaging the upper face of the base, links connectingthe sections with the plunger, a key located beneath the base and engaging the same and the plunger, and a top plate detaehably mounted on the upper portion of the plunger and forming a cover for the core.

In testimony, that I claim the foregoing as my own, I have hereto aiiixed my sig nature in the presence of two Witnesses.

l JOHN B. WALKER; Witnesses:

J. A. DUPUY, R. P. MCLEOD. p 

